I have had rams pull them out if they have fence line contact. One was very adept at that. This year , the teaser ram was the culprit.
He got over it by last breeding cycle.
He ran with my non cidred and cidred ewe lambs at same time. He was pulled same day cidrs were. All non cidred ewe lambs breed before the cidred ones came in cyle. That will be a busy 3 days. Historically ,95 percent of mine breed and stick on that service date.
35 ewe lambs bred in 3 days.
As to retained CIDR. The only one of mine last year , to not breed was one I forgot to pull CIDR until day 20.
I did a 14 day insertion last year and while worked, 25 percent remarked and lambed on second cycle.
Previous years and this year was 7 day insertion.
They sync better for me on 7 day I section.
But been really perfect fall here for breeding.
Fall lambers are running with March lambing gruop.
Ram still in that gruop. Last lamb born in that gruop ,about 4 weeks ago. Have observed 80 percent of that lambing gruop,being marked in last week. So will see ,if they stick, while nursing lambs..:-)